An installer is the first experience of a user with your application. Slow or unsuccesful software installations are the most irritating computer problems. A quick and user friendly installer is therefore an essential part of your software product.
NSIS (Nullsoft Scriptable Install System) is a tool that allows programmers to create such installers for Windows. It is released under an open source license and is completely free for any use.
For more information please visit the NSIS Home Page or Project Page.